HRP20131028T1 - Noninvasive method and apparatus for measuring blood pressure determining a maximum frequency of spectral content of the second heart sound - Google Patents

Noninvasive method and apparatus for measuring blood pressure determining a maximum frequency of spectral content of the second heart sound Download PDF

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Publication number
HRP20131028T1
HRP20131028T1 HRP20131028AT HRP20131028T HRP20131028T1 HR P20131028 T1 HRP20131028 T1 HR P20131028T1 HR P20131028A T HRP20131028A T HR P20131028AT HR P20131028 T HRP20131028 T HR P20131028T HR P20131028 T1 HRP20131028 T1 HR P20131028T1
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Croatia
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component
blood pressure
frequency
signal
diastolic
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HRP20131028AT
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Croatian (hr)
Inventor
Lorenzo Peretto
Alberto Bauer
Andrea Mollo
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Longhini, Luca
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Publication of HRP20131028T1 publication Critical patent/HRP20131028T1/en

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    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00Measuring for diagnostic purposes; Identification of persons
    • A61B5/02Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
    • A61B5/021Measuring pressure in heart or blood vessels
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B7/00Instruments for auscultation
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B7/00Instruments for auscultation
    • A61B7/02Stethoscopes
    • A61B7/04Electric stethoscopes

Claims (13)

1. Postupak za neinvazivnu procjenu krvnog tlaka, naznačen time da se navedeni postupak sastoji od: a) primjene pojasnog filtera na komponentu drugog srčanog zvuka (S2) kako bi se generirala filtrirana komponenta S2, te pojasni filter ima promjenjivu donju graničnu frekvenciju koja je inicijalno veća od najveće frekvencije komponente S2; b) procjene maksimalne frekvencije komponente S2 korištenjem filtrirane komponente S2, uključivši (b1) računanje omjera između komponente S2 i filtrirane komponente S2; (b2) smanjivanje donje granične frekvencije i ponavljanje (a) i (b1) sa smanjenom donjom graničnom frekvencijom kako bi se izračunao omjer, te se donja granična frekvencija smanjuje sve dok je izračunati omjer manji od ili jednak unaprijed određenom pragu, pri čemu se smanjena donja granična frekvencija koristi za određivanje procijenjene maksimalne frekvencije komponente S2; c) primjene unaprijed određenog odnosa između određene procijenjene maksimalne frekvencije i krvnog tlaka za generirane procjene krvnog tlaka; te d) prikazivanje procjene krvnog tlaka.1. Procedure for non-invasive assessment of blood pressure, characterized by the fact that said procedure consists of: a) applying a bandpass filter to the component of the second heart sound (S2) in order to generate the filtered component S2, and the bandpass filter has a variable lower cutoff frequency that is initially higher than the highest frequency of the component S2; b) estimates of the maximum frequency of component S2 using the filtered component S2, including (b1) calculating the ratio between the component S2 and the filtered component S2; (b2) reducing the lower cut-off frequency and repeating (a) and (b1) with the reduced cut-off frequency to calculate the ratio, and reducing the cut-off frequency as long as the calculated ratio is less than or equal to a predetermined threshold, thereby reducing the lower limit frequency is used to determine the estimated maximum frequency of component S2; c) applying a predetermined relationship between a certain estimated maximum frequency and blood pressure for the generated blood pressure estimates; you d) display of blood pressure estimation. 2. Postupak prema zahtjevu 1, naznačen time da su svaka S2 komponenta i filtrirana S2 komponenta prikazane sa odgovarajućom vrijednosti amplitude, te se vrijednost amplitude izračunava iz barem jedne vrijednosti odabrane od vrijednosti kvadratnog korijena srednjeg kvadrata (rms), vršne vrijednosti ili srednje vrijednosti apsolutne vrijednosti.2. The method according to claim 1, characterized in that each S2 component and the filtered S2 component are displayed with a corresponding amplitude value, and the amplitude value is calculated from at least one value selected from the root mean square (rms) value, the peak value or the mean absolute value values. 3. Postupak prema zahtjevu 1, naznačen time da krvni tlak uključuje plućni arterijski tlak (PAP), te korak (c) uključuje primjenu unaprijed određenog odnosa između procijenjene maksimalne frekvencije i PAP radi generiranja procjene PAP vrijednosti.3. The method of claim 1, wherein the blood pressure includes pulmonary arterial pressure (PAP), and step (c) includes applying a predetermined relationship between the estimated maximum frequency and the PAP to generate an estimate of the PAP value. 4. Postupak prema zahtjevu 1 ili 2, naznačen time da dodatno uključuje, prije koraka (a), korake: izdvajanje dijastoličkog signala iz signala fonokardiograma (PCG); i izolaciju komponente S2 iz dijastoličkog signala, pri čemu se izolirana komponenta S2 koristi za generiranje filtrirane komponente S2.4. The method according to claim 1 or 2, characterized in that it additionally includes, before step (a), the steps: extracting the diastolic signal from the phonocardiogram (PCG) signal; and isolation of the S2 component from the diastolic signal, where the isolated component S2 is used to generate the filtered component S2. 5. Postupak prema zahtjevu 4, naznačen time da korak izoliranja komponente S2 sadrži: integraciju barem dijela dijastoličkog signala unutar integracijskog okvira radi određivanja ciljanog intervala uključujući komponentu S2; te izdvajanje komponente S2 iz dijastoličkog signala korištenjem ciljanog intervala da se formira izolirana komponenta S2.5. The method according to claim 4, characterized in that the step of isolating component S2 contains: integrating at least a portion of the diastolic signal within the integration frame to determine the target interval including the S2 component; you extracting the S2 component from the diastolic signal using the target interval to form an isolated S2 component. 6. Postupak prema zahtjevu 4 ili 5, naznačen time da dijastolički signal uključuje veći broj dijastoličkih signala i procjena krvnog tlaka se generira u skladu sa većim brojem izoliranih S2 komponenata odgovarajućeg većeg broja dijastoličkih signala.6. The method according to claim 4 or 5, characterized in that the diastolic signal includes a greater number of diastolic signals and the blood pressure estimate is generated in accordance with a greater number of isolated S2 components of the corresponding greater number of diastolic signals. 7. Postupak prema zahtjevu 6, naznačen time da dodatno uključuje korake: ponavljanje koraka (a)-(c) na mnoštvu izoliranih komponenata S2 radi generiranja odgovarajućeg većeg broja procjena krvnog tlaka; te utvrđivanje načina većeg broja procjena krvnog tlaka radi generiranja načina procjene krvnog tlaka.7. The method according to claim 6, characterized in that it additionally includes the steps: repeating steps (a)-(c) on a plurality of isolated components S2 to generate a correspondingly larger number of blood pressure estimates; you determination of the method of a number of blood pressure estimations in order to generate the method of blood pressure estimation. 8. Postupak prema zahtjevu 7, naznačen time da dodatno uključuje korak određivanje intervala pouzdanosti mjerenja povezanog sa većim brojem procjena krvnog tlaka i načinom procjene krvnog tlaka.8. The method according to claim 7, characterized in that it additionally includes the step of determining the reliability interval of the measurement associated with a greater number of blood pressure assessments and the method of blood pressure assessment. 9. Postupak prema zahtjevu 4, 5, 6, 7, ili 8, naznačen time da izdvajanje dijastoličkog signala sadrži korake: sinkroniziranog prijema PCG signala i signala elektrokardiograma (EKG); te izdvajanje dijastoličkog signala iz primljenog PCG signala korištenjem primljenog EKG signala.9. The method according to claim 4, 5, 6, 7, or 8, characterized in that extracting the diastolic signal includes the steps: synchronized reception of PCG signals and electrocardiogram (ECG) signals; you extracting the diastolic signal from the received PCG signal using the received ECG signal. 10. Uređaj za analizu krvnog tlaka za neinvazivnu procjenu krvnog tlaka, naznačen time da se uređaj za analizu krvnog tlaka sastoji od: uređaja za procjenu frekvencije koji sadrži: ulazni priključak uređaja za procjenu koji je konfiguriran za primanje komponente drugog srčanog zvuka (S2); pojasni filter spojen na ulazni priključak uređaja za procjenu i predviđen za generiranje filtrirane komponente S2 iz komponente S2, te pojasni filter ima promjenjivu donju graničnu frekvenciju koja je inicijalno veća od maksimalne frekvencije komponente S2; kalkulator omjera spojen na ulazni priključak uređaja za procjenu i pojasnog filtera, te je kalkulator omjera podešen za izračun omjera između komponente S2 i filtrirane komponente S2; te regulator frekvencije povezan sa kalkulatorom omjera i pojasnim filtrom, te je regulator frekvencije podešen da smanjuje donju graničnu frekvenciju koja se dostavlja u pojasni filter kao odgovor na izračunati omjer koji je primljen iz kalkulatora omjera, pri čemu je regulator frekvencije podešen da smanjuje donju graničnu frekvenciju sve dok je izračunati omjer primljen iz kalkulatora omjera manji od ili jednak unaprijed određenom pragu, pri čemu je uređaj za procjenu frekvencije podešen da procjenjuje maksimalnu frekvenciju komponente S2 korištenjem filtrirane komponente S2, te se smanjena donja granična frekvencija koristi za određivanje procijenjene maksimalne frekvencije komponente S2; i uređaja za procjenu krvnog tlaka koji je povezan sa uređajem za procjenu frekvencije i podešen je za primjenu unaprijed određenog odnosa između procijenjene maksimalne frekvencije i krvnog tlaka da se dobije procjena krvnog tlaka.10. Blood pressure analysis device for non-invasive blood pressure assessment, characterized in that the blood pressure analysis device consists of: frequency estimation device containing: an input port of the evaluation device configured to receive a component of the second heart sound (S2); a bandpass filter connected to the input port of the evaluation device and designed to generate the filtered component S2 from the component S2, and the bandpass filter has a variable lower cutoff frequency that is initially higher than the maximum frequency of the component S2; a ratio calculator connected to the input port of the evaluation device and the bandpass filter, and the ratio calculator is set to calculate the ratio between the component S2 and the filtered component S2; you a frequency controller coupled to the ratio calculator and the bandpass filter, and the frequency controller is configured to reduce the lower cutoff frequency supplied to the bandpass filter in response to the calculated ratio received from the ratio calculator, wherein the frequency controller is set to reduce the lower cutoff frequency as long as the calculated ratio received from the ratio calculator is less than or equal to a predetermined threshold, wherein the frequency estimator is configured to estimate the maximum frequency of component S2 using the filtered component S2, and the reduced lower cutoff frequency is used to determine the estimated maximum frequency of component S2; and a blood pressure estimator coupled to the frequency estimator and configured to apply a predetermined relationship between the estimated maximum frequency and the blood pressure to obtain an estimate of the blood pressure. 11. Uređaj za analizu krvnog tlaka prema zahtjevu 10, naznačen time da krvni tlak uključuje plućni arterijski tlak (PAP) i uređaj za procjenu krvnog tlaka koji je podešen da generira procjenu PAP primjenom unaprijed određenog odnosa između PAP i procijenjene maksimalne frekvencije.11. The blood pressure analysis device of claim 10, wherein the blood pressure includes pulmonary arterial pressure (PAP) and a blood pressure estimator configured to generate an estimate of PAP using a predetermined relationship between PAP and an estimated maximum frequency. 12. Uređaj za analizu krvnog tlaka prema zahtjevu 10 ili 11, naznačen time da dodatno sadrži: ulazni priključak za primanje signala fonokardiograma (PCG); ekstraktor dijastoličkog signala povezan na ulazni priključak, te je ekstraktor dijastoličkog signala podešen za izdvajanje dijastoličkog signala iz PCG signala; te izolator komponente S2 koji je podešen za izoliranje S2 komponente iz izdvojenog dijastoličkog signala, na temelju integracije barem dijela izdvojenog dijastoličkog signala, pri čemu se izolirana komponenta S2 dostavlja na ulazni priključak uređaja za procjenu frekvencije.12. Device for blood pressure analysis according to claim 10 or 11, characterized in that it additionally contains: input port for receiving phonocardiogram (PCG) signals; a diastolic signal extractor connected to the input port, and the diastolic signal extractor is set to extract the diastolic signal from the PCG signal; you an S2 component isolator that is configured to isolate the S2 component from the extracted diastolic signal, based on the integration of at least part of the extracted diastolic signal, whereby the isolated component S2 is supplied to the input port of the frequency estimator. 13. Uređaj za analizu krvnog tlaka prema zahtjevu 12, naznačen time da je ulazni priključak nadalje podešen za primanje signala elektrokardiograma (EKG) koji odgovara signalu PCG, te pri čemu je uređaj za izdvajanje dijastoličkog signala podešen za izdvajanje dijastoličkog signala korištenjem odgovarajućeg EKG signala.13. Blood pressure analysis device according to claim 12, characterized in that the input port is further adjusted to receive an electrocardiogram (ECG) signal corresponding to the PCG signal, and wherein the diastolic signal extraction device is configured to extract the diastolic signal using the corresponding ECG signal.
HRP20131028AT 2007-08-28 2013-10-30 Noninvasive method and apparatus for measuring blood pressure determining a maximum frequency of spectral content of the second heart sound HRP20131028T1 (en)

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US96844007P 2007-08-28 2007-08-28
US12/199,217 US8202225B2 (en) 2007-08-28 2008-08-27 Noninvasive method and apparatus for measuring blood pressure by determining a maximum frequency of spectral content of the second heart sound
PCT/IB2008/002236 WO2009027804A1 (en) 2007-08-28 2008-08-28 Noninvasive method and apparatus for measuring blood pressure determining a maximum frequency of spectral content of the seco heart sound

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US10130267B2 (en) 2012-03-08 2018-11-20 Medtronic, Inc. Heart sound monitoring of pulmonary hypertension
EP3019077B1 (en) * 2013-07-11 2020-10-21 Coala-Life AB Classifying heart sounds
CN105011923A (en) * 2015-08-05 2015-11-04 哈尔滨工业大学 Reflection-type heart rate monitoring method based on moving window integration
CN105105734B (en) * 2015-09-11 2018-02-27 深圳先进技术研究院 A kind of noninvasive continuous blood pressure measurement device based on cardiechema signals
US11445982B2 (en) 2017-02-08 2022-09-20 Wayne State University Method and apparatus for determining blood pressure on measured heart sounds
KR101931187B1 (en) * 2017-06-23 2018-12-20 재단법인 아산사회복지재단 Method, apparatus and computer program for determining the cause of blood pressure change noninvasively
CN110074817B (en) * 2019-04-04 2022-09-23 肯尼斯.粲.何 Method and equipment for randomly detecting or dynamically monitoring central arterial pressure and cardiac function
TWI729808B (en) * 2020-05-14 2021-06-01 廣達電腦股份有限公司 Auscultation device and auscultation method using auscultation device

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US6368283B1 (en) 2000-09-08 2002-04-09 Institut De Recherches Cliniques De Montreal Method and apparatus for estimating systolic and mean pulmonary artery pressures of a patient
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US7828740B2 (en) 2005-08-03 2010-11-09 Luca Longhini Noninvasive apparatus and method for estimating blood pressure

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